JavaW3

package com.work;

public abstract class Shape {
    protected String color;
    protected boolean filled;

    public Shape(){
    }
    public Shape(String color, boolean filled){
        setColor(color);
        setFilled(filled);
    }
    public String getColor(){
        return color;
    }
    public void setColor(String color){
        this.color = color;
    }
    public boolean isFilled(){
        return filled;
    }
    public void setFilled(boolean filled){
        this.filled = filled;
    }

    public abstract double getArea();
    public abstract double getPerimeter();
    public abstract String ToString();
}
/////////////////////////////////////////////////////////////////////////////////

package com.work;

public class Circle extends Shape{
    protected double radius;

    public Circle(){}
    public Circle(double radius){
        super();
        setRadius(radius);
    }
    public Circle(double radius, String color, boolean filled){
        super(color, filled);
        setRadius(radius);
    }
    public double getRadius(){
        return radius;
    }
    public void setRadius(double radius) {
        this.radius = radius;
    }

    @Override
    public double getArea() {
        return Math.PI * radius * radius;
    }

    @Override
    public double getPerimeter() {
        return 2 * Math.PI * radius;
    }

    @Override
    public String ToString() {
        return "Radius: " + radius + "\n" + "Area: " + this.getArea() + "\n" + "Perimeter: " + this.getPerimeter();
    }
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package com.work;

public class Rectangle extends Shape{
    protected double width;
    protected double length;

    public Rectangle(){

    }
    public Rectangle(double width, double length){
        setWidth(width);
        setLength(length);
    }
    public Rectangle(double width, double length,  String color, boolean filled){
        super(color, filled);
        setWidth(width);
        setLength(length);
    }
    public double getWidth(){
        return width;
    }
    public void setWidth(double width) {
        this.width = width;
    }
    public double getLength(){
        return length;
    }
    public void setLength(double length){
        this.length = length;
    }

    @Override
    public double getArea() {
        return width * length;
    }

    @Override
    public double getPerimeter() {
        return 2 * (width + length);
    }

    @Override
    public String ToString() {
        return "Width: " + this.getWidth() + "\n" + "Length: " + this.getLength() + "\n" + "Area: " + this.getArea() + "\n" + "Perimeter: " + this.getPerimeter();
    }
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package com.work;

public class Square extends Rectangle{
    protected double side;

    public Square(){}
    public Square(double side){
        super(side, side);
    }
    public Square(double side, String color, boolean filled){
        super(side, side, color, filled);
    }
    public double getSide(){
        return length;
    }
    public void setSide(double side){
        length = side;
        width = side;
    }

    @Override
    public void setWidth(double side) {
        setSide(side);
    }

    @Override
    public void setLength(double side) {
        setSide(side);
    }

    @Override
    public String ToString() {
        return "Side: " + this.getSide() + "\n" + "Area: " + this.getArea() + "\n" + "Perimeter: " + this.getPerimeter();
    }
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package com.work;

public class Main {
    public static void main(String[] args) {
        Shape s1 = new Circle(5.5, "RED", false);
        System.out.println(s1);
        System.out.println(s1.getArea());
        System.out.println(s1.getPerimeter());
        System.out.println(s1.getColor());
        System.out.println(s1.isFilled());
        System.out.println(s1.ToString());
        // Ошибка: у класса Shape нет метода getRadius()
        //System.out.println(s1.getRadius());
        Circle c1 = (Circle)s1;
        System.out.println(c1);
        System.out.println(c1.getArea());
        System.out.println(c1.getPerimeter());
        System.out.println(c1.getColor());
        System.out.println(c1.isFilled());
        // у класса Circle есть метод getRadius()
        System.out.println(c1.getRadius());
        // Ошибка: нельзя создать экземпляр абстрактного класса
        //Shape s2 = new Shape();
        Shape s3 = new Rectangle(1.0, 2.0, "RED", false);
        System.out.println(s3);
        System.out.println(s3.getArea());
        System.out.println(s3.getPerimeter());
        System.out.println(s3.getColor());
        // Ошибка: у класса Shape не метода getLength()
        //System.out.println(s3.getLength());
        Rectangle r1 = (Rectangle)s3;
        System.out.println(r1);
        System.out.println(r1.getArea());
        System.out.println(r1.getColor());
        // у класса Rectangle есть метод getLength()
        System.out.println(r1.getLength());
        Shape s4 = new Square(6.6, "blue",true );
        System.out.println(s4);
        System.out.println(s4.getArea());
        System.out.println(s4.getColor());
        // Ошибка: у класса Shape нет метода getSide()
        //System.out.println(s4.getSide());
        Rectangle r2 = (Rectangle)s4;
        System.out.println(r2);
        System.out.println(r2.getArea());
        System.out.println(r2.getColor());
        // Ошибка: у класса Rectangle тоже нет метода getSide()
        //System.out.println(r2.getSide());
        System.out.println(r2.getLength());
        Square sq1 = (Square)r2;
        System.out.println(sq1);
        System.out.println(sq1.getArea());
        System.out.println(sq1.getColor());
        // у класса Square есть метод getSide()
        System.out.println(sq1.getSide());
        System.out.println(sq1.getLength());
    }
}